Materials Literature
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This Account presents recent advances in the design, synthesis, characterization, and potential applications of new hybrid materials based on carbon nanotube and electron donors. Fast charge separation and slow charge recombination are consistently observed in a variety of composites that contain porphyrin derivatives…
By confining water in nanopores of silica glass, we can bypass the crystallization and study the pressure effect on the dynamical behavior in deeply supercooled state using neutron scattering. We observe a clear evidence of a cusplike fragile-to-strong (FS) dynamic transition. Here we show that the transition temperat…
Was the β-hairpin fished out from a conformationally defined peptide library of close to 140 000 structures really stabilized? Or was the unexpected Ile residue at the hydrogen-bonded position a mistake in the selection procedure? It seems that the answer is yes, it was. The β-branched side chains of Ile and Val (at p…
Vierfach verdreht: Ein Aggregat aus vier N-invertierten Porphyrinatosilber(III)-Untereinheiten (siehe Struktur; N blau, Ag oliv, C grau/rot) um einen Cyclus, der zwei Silber(I)-Ionen enthält, entsteht effizient durch Kombinieren der freien Base eines dimeren N-invertierten Porphyrins mit einem Silber(I)-Salz.
We grew well-ordered arrays of ferroelectric Pb(Zr0.2Ti0.8)O3 (PZT) nanodots on a SrRuO3∕SrTiO3 substrate by pulsed laser deposition. A silicon nitride shadow mask with ordered holes was used for patterning of the PZT arrays. Each dot has a height of ∼15nm and a diameter of ∼120nm with a similar dome shape over a larg…
The optical and electron paramagnetic resonance (EPR) properties of InP nanocrystals, in which metallic gold or indium is present as an incorporated part of the nanocrystals, have been studied. A study of Au/InP quantum rods supports different carrier localization regimes compared to metal-free quantum rods, including…
Large-scale Monte Carlo simulations of a phase-separating colloid-polymer mixture are performed and compared to recent experiments. The approach is based on effective interaction potentials in which the central monomers of self-avoiding polymer chains are used as effective coordinates. By incorporating polymer nonidea…
Atomic structures of stable liquid and undercooled liquid Al(80)Mn(20) and Al(80)Ni(20) alloys have been calculated by first-principles molecular-dynamics simulations. For both alloys, the local structure as defined by the Faber-Ziman pair-correlation functions is characterized by a strong Al-transition-metal affinity…
The axially chiral dopants (R)-5,5'-, 5,6'-, and 6,6'-diheptyloxy-2,2'-spirobiindan-1,1'-dione ((R)-2, -3, and -4) were synthesized in optically pure form, and their absolute configurations were assigned by the exciton chirality method using circular dichroism spectroscopy. These new compounds were doped in four achir…
Synthesis and characterization of new naphthalene-based PFCB aryl ether polymeric isomers with 1,5-, 1,6-, 2,6-, and 2,7-linkages were described. Monomers of perfluorocyclobutane (PFCB) poly(aryl ether)s, 1,5-, 1,6-, 2,6-, and 2,7-bis(trifluorovinyloxy)naphthalene, were synthesized from dihydroxynaphthalenes in two st…
Abstract Summary: Uniform one‐dimensional (1D) structures of o ‐phenylenediamine (oPD) oligomers are obtained by direct mix of AgNO 3 and oPD aqueous solutions at room temperature. The formation of the 1D structures involves two stages: (1) oxidation of oPD by AgNO 3 , yielding individual oPD oligomers; and (2) self‐a…
Four-gone confusion! An assembly of four N-confused porphyrinatosilver(III) subunits (see structure; N blue, Ag olive-colored, C silver/red) placed on the perimeter of a cyclic structure that comprises two silver(I) ions is effectively formed from a bis(N-confused porphyrin) free base and a silver(I) salt.
Metal-semiconductor-metal planar devices have been fabricated on as-grown boron-doped homoepitaxial diamond thin films. They consist of two Schottky barriers connected back to back. The metal employed was a thin titanium (Ti) layer (5nm) followed by a gold (Au) cap layer (50nm), respectively. The structure shows a hig…
The luminescence spectroscopy study and the determination of the photophysical parameters for the M-M'-bonded rhodium meso-tetraphenylporphyrin-tin(2,3,7,13,17,18-hexamethyl-8,12-diethylcorrole) complex, (TPP)Rh-Sn(Me6Et2Cor) 1, was investigated. The emission bands as well as the lifetimes (tau(e)) and the quantum yie…
A new ligand, LC, bis-[(6'-carboxy-2,2'-bipyridine-6-yl)]phenylphosphine oxide, in which the tridentate 6-carboxy-2,2'-bipyridyl arms are directly linked to a phenylphosphine oxide fragment, has been synthesized. The corresponding [Ln.LC]Cl.xH2O complexes (Ln = Eu, x = 4, and Tb, x = 3) were isolated from solutions co…
Mechanically alloyed ${\mathrm{Co}}_{0.2}{\mathrm{Zn}}_{0.8}{\mathrm{Fe}}_{2}{\mathrm{O}}_{4}$ nanoparticle has shown the enhancement of both magnetization and ferrimagnetic order which seems to be unusual according to the existing core-shell model of ferrimagnetic nanoparticle. Many concurrent effects such as site ex…
Mesostructured silica films have been doped with lead sulfide (PbS) nanocrystals by a two-step impregnation, using the mesopores as nanoreactors for PbS growth. Secondary ion mass spectrometry and transmission electron microscopy characterizations demonstrated nanocrystals growth inside the pores and throughout the fi…
Telechelic random copolymers were prepared by copolymerization of ε-caprolactone (εCL) and trimethylene carbonate (TMC) in bulk using bismuth(III) hexanoate, Bi(OHex) 3, as initiator. These copolymers were characterized by 1 H and 13 C NMR spectroscopy. A−B−A triblock copolymers were synthesized by chain extension of…
Porphyrins bearing four urea-linked dodecyl groups (3a) or four urea-linked triethoxysilylpropyl groups (3TEOS) at their peripheral positions were synthesized. 3a tends to assemble into a sheetlike two-dimensional structure due to the predominant hydrogen-bonding interaction among the urea groups and acts as a moderat…
The fragilities (T(g)-normalized temperature dependence of alpha-relaxation times) of 33 glass-forming liquids and polymers are compared for isobaric, mP, and isochoric, mV, conditions. We find that the two quantities are linearly correlated: mP = (37+/-3) + (0.84+/-0.05)mV. This result has obvious and important conse…